Sand-drier.



Patented Feb. 4, I902.

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S A N D D R l E B.

(Applictiqn filed Tune 1, 1901.

(No Model.)

n4: NORRIS mans coy. mcn'dumo" WASHINGTON. u. c.

. Nrrnn STATES ATENT OFFICE.

CHARLES LINDSTROM, OF BLOOMINGTON, ILLINOIS, ASSIGNOR OF ONE-HALF TO CLARENCE M. MENDENl-IALL, OF BLOOMINGTON, ILLINOIS.

SAND-DRIER.

SPECIFICATION formingpart'of Letters Patent No. 692,791, dated February 4, 1902.

Application filed June 4,1901.

To all whom it may concern.-

Be it known that I, CHARLES LINDSTROM, a citizen of the United States, and a resident of Bloomington, Illinois, have invented certain Improvements in Sand-Driers, of which the following is a specification.

The object of my invention is to so construct a sand-drier as to provide for the free escape from the sand of the vapor developed by the action of heat upon the moisture in the mass. This object I attain in the man'- ner'hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a vertical sectional view of a sand-drier constructed in accordance with my invention. Fig. 2 is a sectional plan view of the same on the line cm, Fig. 1. Fig. 3 is an enlarged view of part of the drier. Fig. lis a side view illustrating another embodiment of my invention, and Fig. 5 is a sectional plan view of the same.

Sand for use in sand-boxes of locomotives requires to be thoroughly dried to prevent the clogging of the delivery-pipes, which is likely to result if the sand is in a moist or adherent condition, and many forms of sanddriers have been devised, none of which, however, so far as I am aware, have been provided with efficient means for the escape of the vapors developed by the action of the heat upon the moisture in the mass of sand during the drying operation. Hence it frequently happens that this vapor accumulates in the mass until it is under such pressure as to dislodge the sand and eject it forcibly from the heater or cause bursting of the latter, in any event interfering with the operation of the heater and reducing the capacity of the same.

My invention has therefore been designed with the view of overcoming these objections and providing for the ready escape of the vapor from all portions of the mass of sand under treatment.

In the drawings, 1 represents the casing of the drier, which may be of any suitable size and shape, but which is preferably cylindrical, and 2 is a fire-pot contained within said casing and communicating through a series of vertical flues 3 with an upper smokechamber 4, which has a suitable stack 5, the top 6 of the fire-pot being conical, so as to di- Serial No. 63,101. (No model.)

rect the dry sand into a well 7, intervening between the sides of the fire-pot and the lower portion of the casing 1, from which well the dry sand can be withdrawn in any suitable manner. The fire-pot has the usual feedopening 9 and ash-pit 10. Within the sandchamber of the drier and surrounding the series of fines 3 is a coiled pipe 11 of circular or other form in cross-section and of a diameter or size sufficient to freely carry off all of the vapors generated by the heating of the ,moisture in the sand, the lower end of this ,viding the line of. least resistance for the escape of the moisture from the mass. When the upper end of the pipe communicates with the stack 5, this tendency is aided by the fact that the draft in the stack tends to form a partial vacuum in the pipe, and thus induce flow into the latter through the perforations 13, the lower ,end of the pipe being closed, so that no air can enter the same at that point.

There is no tendency for the openings 13 in the under side of the pipe'll to become clogged by the sand, for the latter in flowing in beneath the pipe seeks the natural angle -of re- ,pose, as shown in Fig. 3, and thereby forms below each convolution of the pipe a chamber 14: in line with the row of perforations in the under side of the pipe. Hence free acoess to the perforations 13 of air or vapor drivenoff from the mass of sand by the heat is always insured. While, therefore, I prefer in all cases to form perforations in the under side of the pipe, my invention in its broader embodiment is not limited to this location of the perforations, since the latter may in some cases be formed in the sides of the pipe or even in the top of the pipe when the draft through the latter is sufficiently strong.

The pipe 11 is suitably supported in the sand-chamber of the drier by means of a series of vertical legs or posts 15, three of which are shown in the present instance, the convolutions of the coil being secured to these logs or posts by suitable clips, which in the present instance are formed by bending a strip of sheet metal 16 and securing it to the legs or posts at points between the convolutions of the coil by means of bolts, rivets, screws, or other suitable fastenings.

More than one of the pipes 11 may be used, if desired, and the lower end of the pipe may be open or provided with a detachable cap, so as to permit of the discharge of any sand that may enter the pipe.

Although I prefer in all cases to use a vapor-escape pipe in the form of a continuous coil, it is not absolutely essential to the proper carrying out of my invention, as a series of independent pipessuch,forinstance, as shown at 17 in Fig. etmay be employed, these pipes communicating with one or more uptakepipessncl1, for instance, as shown at 19 in said figure-and said independent pipes may either be inclined or horizontally disposed.

Having thus described my invention, I claim and desire to secure by Letters Patcut- 1. A sand-drier consisting of a casing having a tire-pot, fines for said fire-pot extending upwardly through the casing and a vaporescape pipe having a series of convolutions disposed one above another in the space between the fiues and the casing, said convolutions being provided with openings for carrying off vapor, substantially as described.

2. A sand-drier consisting ofa casing having a fire-pot, fines from said fire-pot extending upwardly through the casing and a vaporescape pipe having a series of convolutions disposed one above another in the space between the fines and the casing, said convolutions being provided with openings intheir under sides for carrying off vapor, substantially as described.

3. In a sand-drier the combination of a casing, a fire-pot having fines extending upwardly through the casing, a smoke-chamber into which said fines discharge, and a vaporescape pipe having convolutions disposed one above another in the annular space between the casing and said fines, said escape-pipe communicating with the smoke-chamber and said convolutions having openings for the escape of vapor from the sand, substantiallyas described.

4. In a sand-drier the combination of a cas ing, a fire-pot having fines extending upwardly through the casing, and a continuous coii of pipe presenting convolutions one above another within the annular space between the casing and said fines, said convolutions having openings through which vapor from the mass of sand can enter the same, substantially as described.

5. In a sand-drier the combination of a casing, a fire-pot having fines extending upwardly through the casing, a smoke-chamber into which said fines discharge and a continuous coil of pipe disposed in the annular space between the casing and said fines and presenting convolutions one above another which are provided with a number of openings, said pipe communicating with the smoke-chamber, substantially as described.

6. In a sand-drier the combination of a casing, a fire-pot having fines extending upwardly through the same, a smoke-chamber into which said fines discharge, a continuous coil of pipe in the annular space between the casing and said lines, the same presenting convolutions one above another, which convolutions have a number of openings in their under sides, said pipe communicating with the smoke chamber, substantially as described.

7. The combination in a sand-drier of a casing, a fire-pot and a smoke-chamber having flnes extending between them, and a continuous coil of pipe within the annular space between the casing and the said fines, the convoln tions of said coil extending substantially from the bottom to the top of said annular space and having openings for the escape of vapor from the sand, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES LINDSTROM.

\Vitnesses:

JNo. F. JOHNSON, HARRY J. MAGANN. 

